Vlan Configuration; Figure 138: Igmp Snooping Vlan Configuration; Table 121: Igmp Snooping Vlan Configuration Fields - D-Link DWS-4026 User Manual

Software User Manual
12/10/09
VLAN C
ONFIGURATION
Use the IGMP Snooping VLAN Configuration page to configure IGMP snooping settings for VLANs on the system.
To access the IGMP Snooping VLAN Configuration page, click LAN > L2 Features > IGMP Snooping > VLAN
Configuration in the navigation tree.
Field
VLAN ID
Admin Mode
Fast Leave Admin Mode
Group Membership Interval
Maximum Response Time
Operational Maximum
Response Time
Document 34CSFP6XXUWS-SWUM100-D7

Figure 138: IGMP Snooping VLAN Configuration

Table 121: IGMP Snooping VLAN Configuration Fields

Description
From the drop-down menu, select the VLAN ID of the VLAN to modify, or select New
Entry to configure settings for a VLAN that does not have IGMP Snooping enabled.
Enable is the only available option from the drop-down menu. To disable the IGMP
snooping admin mode on the VLAN, select the VLAN from the VLAN ID field and click
Delete.
Enabling fast-leave allows the switch to immediately remove the layer 2 LAN interface
from its forwarding table entry upon receiving an IGMP leave message for that
multicast group without first sending out MAC-based general queries to the interface.
You should enable fast-leave admin mode only on VLANs where only one host is
connected to each layer 2 LAN port. This prevents the inadvertent dropping of the
other hosts that were connected to the same layer 2 LAN port but were still interested
in receiving multicast traffic directed to that group. Also, fast-leave processing is
supported only with IGMP version 2 hosts.
The Group Membership Interval time is the amount of time in seconds that a switch
waits for a report from a particular group on a particular interface before deleting the
interface from the entry. This value must be greater than the IGMPv3 Maximum
Response time value. The range is 2 to 3600 seconds.
Enter the amount of time in seconds that a switch will wait after sending a query on an
interface because it did not receive a report for a particular group in that interface. This
value must be less than the Group Membership Interval time value. The range is 1 to
25 seconds.
This read-only field displays the value for maximum response time of IGMP Snooping
for the specified VLAN ID. Its value is learned dynamically from the IGMPv2 or IGMPv3
queries received on this VLAN. For the multicast traffic not to get disturbed, you should
configure group membership interval to be greater than this value.
D-Link Unified Access System
Configuring IGMP Snooping Page 217